Решение:
а) 4 < a < 7 б) 4 < a < 7
3 < b < 5 + 3 < b < 5 *
4+3 < a+b < 5+7 4*3 < ab < 7*5
7 < a+b < 12 12 < ab < 35
в) 3 < b < 5 |*(-1)
-3 > -b > -5
-5 < -b < -3
4 < a < 7
-5 < -b < -3 +
4-5 < a-b < 7-3
-1 < a-b < 4
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Verified answer
Решение:
а) 4 < a < 7 б) 4 < a < 7
3 < b < 5 + 3 < b < 5 *
4+3 < a+b < 5+7 4*3 < ab < 7*5
7 < a+b < 12 12 < ab < 35
в) 3 < b < 5 |*(-1)
-3 > -b > -5
-5 < -b < -3
4 < a < 7
-5 < -b < -3 +
4-5 < a-b < 7-3
-1 < a-b < 4